The points (60,3), (40,-8) and (a, -52) are collinear if a=?
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Answer:
Three points A(
a
),B(
b
),C(
c
) are collinear if
AB
∣∣
AC
AB
=−20
i
−11
j
AC
=(a−60)
i
−55
j
⇒
AB
∣∣
AC
⇒
−20
a−60
=
−11
−55
⇒a=−40
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